Thomas Preston-Werner is a software developer, inventor and entrepreneur. He is an active contributor amongst the open-source development community, most prominently in the San Francisco Bay Area where he lives.

Preston-Werner is most prominently known for his role as founder and former CEO of GitHub, a Git repository web-based hosting service, which he co-founded in 2008 with Chris Wanstrath and PJ Hyett. Preston-Werner is also the creator of the avatar service Gravatar.

Preston-Werner lives in San Francisco with his wife Theresa and their son. His wife is a former grad student in cultural anthropology known for her involvement in historical research and social subjects.

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